JP4039825B2 - Heat exchanger - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a heat exchanger. More specifically, the present invention relates to a heat exchanger that is interposed between a supercharger of an internal combustion engine and an intake port of the internal combustion engine and used to cool intake air.
[0002]
[Prior art]
This type of heat exchanger includes a case having an intake inlet communicating with a supercharger, an outlet communicated with an intake port of an internal combustion engine, and a heat exchange fin housed in the case It has been known. The heat exchange fins are separate from the case, and the heat exchanger is configured by housing the heat exchange fins in the case.
The air flowing into the case from the supercharger through the intake inlet is basically cooled by contacting the heat exchange fins and supplied from the outlet to the intake port of the internal combustion engine.
[0003]
[Problems to be solved by the invention]
In the heat exchanger as described above, it is difficult to completely block between the outer peripheral edge of the heat exchange fin accommodated in the case and the inner wall surface of the case.
For this reason, in the conventional heat exchanger, the outer peripheral edge of the heat exchange fin and the inner wall surface of the case, in addition to the original air flow path, that is, the flow path that enters from the intake inlet and exits from the outlet after contacting the heat exchange fin The flow path which passes through the space currently formed over the perimeter in between was also formed.
Therefore, the conventional heat exchanger has a problem in that the heat exchange rate is not sufficient because a part of the air that has entered from the intake port exits from the outlet through the space with little contact with the heat exchange fins. It was.
[0004]
An object of the present invention is to provide a heat exchanger capable of solving the above problems and improving the heat exchange rate.
[0005]
[Means for Solving the Problems]
  To achieve the above object, a heat exchanger according to claim 1 is interposed between a supercharger of an internal combustion engine and an intake port of the internal combustion engine, and is connected to the supercharger, and the internal combustion engine An outlet communicating with the engine intakeFormed on the same sideCase andMultiple sheets were stacked in a direction perpendicular to the coolant flow direction at a predetermined pitch, and both side surfaces were covered with side platesWith heat exchange finsIn this case, the open surface of the heat exchange fin is accommodated in the case facing the side where the intake inlet and outlet are provided.A heat exchanger,
  In the heat exchange finProvided with a plate that is attached to the opposite side of the intake inlet and outlet and is accommodated in the case together with heat exchange fins,
The plate closes a space between an inner wall surface of the case where the intake inlet and the outlet are formed and an outer peripheral edge of the heat exchange fin between the intake inlet and the outlet. A first plate for closing a space formed between the side plate and the inner wall surface of the case;
A second plate integral with the first plate, having an opening facing the intake inlet and outlet of the case, and positioned so as to be in contact with the upper edge of the side plate; And a second plate that closes a space formed between the inner wall surface ofIt is characterized by.
  Claim2The heat exchanger as claimed in claim1The described heat exchanger is characterized in that a net member for preventing passage of foreign matter is provided at the outlet.
  Claim3The heat exchanger as claimed in claim2In the described heat exchanger, the net member is provided integrally with the plate.
  Claim4The heat exchanger as claimed in claim2 or 3It is a heat exchanger of description, Comprising: It is used for a small ship.
[0006]
[Function and effect]
The heat exchanger according to claim 1 is interposed between a supercharger of the internal combustion engine and an intake port of the internal combustion engine, and is connected to an intake port communicating with the supercharger and an intake port of the internal combustion engine. A heat exchanger having a case having an outlet and a heat exchange fin accommodated in the case, wherein a space between the outer peripheral edge of the heat exchange fin and the inner wall surface of the case is partially closed However, since a plate separate from the case that forms an air flow path at a portion other than the closed portion is provided, all of the air that has entered from the intake inlet is subjected to heat exchange. After coming into contact with the fin, it will exit from the outlet.
Therefore, according to this heat exchanger, the heat exchange rate is improved, and the effect of improving the cooling efficiency of the intake air can be obtained.
Further, when the blowback of the intake air from the combustion chamber of the internal combustion engine (so-called backfire) occurs, in the conventional heat exchanger, a part of the backfire entering from the outlet is almost not in contact with the heat exchange fins as described above. A special spark arrester or the like is required because there is a risk of exiting from the intake inlet to the supercharger side through a space. According to the heat exchanger according to claim 1, the backfire is a heat exchanger. It is no longer necessary to go directly from the outlet to the intake inlet, and it comes into contact with the heat exchange fins to cool and extinguish the flame, so that it is not necessary to provide a dedicated spark arrester or the like.
Further, since the plate is separate from the case, the space between the outer peripheral edge of the heat exchange fin and the inner wall surface of the case can be closed with a simple structure.
According to the heat exchanger according to claim 2, in the heat exchanger according to claim 1, since the plate is made of aluminum, the intake air and the backfire that are in contact with the plate are efficiently heat drawn.
According to the heat exchanger according to claim 3, in the heat exchanger according to claim 1 or 2, the intake inlet and the outlet are formed on the same side of the case, and between the intake inlet and the outlet. In this case, the plate closes the space between the inner wall surface of the case where the intake inlet and the outlet are formed and the outer peripheral edge of the heat exchange fin. In addition, the heat exchanger itself can be reduced in size.
According to the heat exchanger according to claim 4, in the heat exchanger according to any one of claims 1 to 3, a plurality of the heat exchange fins are laminated at a predetermined pitch, and the plate is at least Since the space between the outer peripheral edge of the single heat exchange fin and the inner wall surface of the case is partially blocked, the pitch of the heat exchange fin effective for cooling efficiency and the extinction of the backfire, and the mounting of the plate The position can be freely selected.
According to the heat exchanger of Claim 5, in the heat exchanger of any one of Claims 1-4, since the net member for foreign material passage prevention is provided in the exit, it is excessive. Even if the feeder and heat exchange fins deteriorate and some of them are peeled off (or dropped off), these foreign matters (peeled off or dropped off) are stopped by the net member, It will never be reached.
In particular, when the heat exchanger is used in a small vessel as described in claim 7, the supercharger and the heat exchange fins are liable to deteriorate. Therefore, the configuration according to claim 5 reduces the size of the heat exchanger. This is particularly effective when used for ships.
According to the heat exchanger according to claim 6, in the heat exchanger according to claim 5, since the net member is provided integrally with the plate, the attachment of the net member is performed simultaneously with the assembly of the plate. This eliminates the trouble of separately attaching the net member.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 is a schematic side view showing an example of a small vessel using an embodiment of a heat exchanger according to the present invention, FIG. 2 is a plan view of the same, and FIG. 3 is a partially enlarged sectional view taken along line III-III in FIG. (Omitted sectional view).
[0008]
As shown in these drawings (mainly FIG. 1), the small boat 10 of this embodiment is a saddle-type small boat, and an occupant sits on a seat 12 on a hull 11 and a steering handle 13 with a throttle lever. It can be operated by holding
The hull 11 has a floating structure in which a lower hull panel 14 and an upper hull panel 15 are joined to form a space 16 therein. In the space 16, an engine (internal combustion engine) 20 is mounted on the lower hull panel 14, and a jet pump 30 as propulsion means driven by the engine 20 is provided at the rear of the lower hull panel 14.
[0009]
The jet pump 30 includes a flow path 33 that extends from the water intake port 17 that opens to the bottom of the ship to a jet port 31 and a nozzle 32 that open to the rear end of the hull, and an impeller 34 that is disposed in the flow path 33. A shaft 35 of the impeller 34 is connected to the output shaft 20 a of the engine 20. Therefore, when the impeller 34 is rotationally driven by the engine 20, the water taken in from the water intake port 17 is ejected from the jet port 31 through the nozzle 32, thereby propelling the hull 11. The driving speed of the engine 20, that is, the propulsive force by the jet pump 30 is operated by rotating the throttle lever 13 a (see FIG. 2) of the operation handle 13. The nozzle 32 is linked to the operation handle 13 by an operation wire (not shown), and is rotated by the operation of the handle 13, thereby changing the course.
Reference numeral 40 denotes a fuel tank, and 41 denotes a storage chamber.
[0010]
FIG. 4 is a view mainly showing the engine 20, and is a partially enlarged sectional view taken along IV-IV in FIG. 1 (partially omitted sectional view), and FIG.
This engine 20 is a DOHC type in-line four-cylinder four-cycle engine, and its crankshaft (see the output shaft 20a) is disposed along the front-rear direction of the hull 11 as shown in FIG.
As shown in FIG. 4, an intake port 21 is arranged on the left side (right side in FIG. 4) of the engine 20 in the traveling direction of the hull 11, and an exhaust port 24 is arranged on the right side (left side in FIG. 4).
[0011]
An intake duct 22 and a surge tank (intake chamber) 23 are connected to the intake port 21, and a heat exchanger (intercooler) 50 is connected to the surge tank 23 immediately below it. Reference numerals 26 and 27 denote mounting brackets of the heat exchanger 50 to the engine 20.
As will be described in detail later, the heat exchanger 50 is connected to and communicated with a compressor portion 71 of a supercharger (turbocharger) 70 disposed just behind the engine 20 as shown in FIG. A case 51 having an intake inlet 51i and an outlet 51o communicating with the intake 21 of the engine 20 via the surge tank 23 and the intake duct 22, and a heat exchange fin 61 accommodated in the case 51 (FIG. 4) Reference).
In FIG. 5, 91 and 92 are cooling water hoses connected to the intercooler 50.
[0012]
On the other hand, as shown in FIG. 4, an exhaust manifold 25 is provided at the exhaust port 24 of the engine 20, and an exhaust outlet 25 o (see FIG. 5) in the exhaust manifold 25 serves as a turbine portion 73 (FIG. 5).
In addition, as shown in FIG. 1 and FIG. 2, the exhaust gas obtained by rotating the turbine in the turbine unit 73 is used to prevent reverse flow of water (intrusion of water into the turbocharger 70 and the like) during pipe overturning. The water is discharged into the water flow by the jet pump 30 through the backflow prevention chamber 75, the water muffler 76, and the pipe 77.
[0013]
6A and 6B are views showing a heat exchanger (intercooler) 50, where FIG. 6A is a plan view and FIG. 6B is a partially cutaway front view. 7A is a right side view, and FIG. 7B is a cross-sectional view taken along line BB in FIG. 6B.
As shown in these drawings and as described above, the heat exchanger 50 includes an intake inlet 51i that communicates with the supercharger (turbocharger) 70 of the engine 20 and an outlet that communicates with the intake 21 of the engine 20. And a heat exchange fin 61 accommodated in the case 51. The intake inlet 51i and the outlet 51o are formed on the same side (in this case, the upper side of the case 51).
[0014]
Specifically, the cooling unit 60 is configured separately from the case 51, and the heat exchanger 50 is configured by housing the cooling unit 60 in the case 51.
[0015]
The cooling unit 60 includes a plurality of heat exchange fins 61 arranged in a stacked manner at a predetermined pitch in the front-rear direction (left-right direction in FIG. 6), the heat exchange fins 61 penetrating in the front-rear direction, and the outer peripheral surface thereof being heated. A plurality of water pipes 62 welded to the exchange fin 61, front and rear support plates 63f and 63r supporting the front and rear of the water pipes 62, and a front support plate 63f are disposed in front of the front support plate. The front member 65f that forms the cooling water W introduction chamber 64i together with 63f and forms the cooling water inflow pipe 65i, and the rear support plate 63r are disposed at the rear of the cooling water W together with the rear support plate 63r. A rear member 65r that forms 64o and forms a cooling water discharge pipe 65o; and a water introduction chamber 64i that is disposed at the front of the heat exchange fin 61 group and welded to the outer peripheral surface of the water pipe 62; Heat exchange An isolation plate 66f for completely isolating the fin 61 group, and a water discharge chamber 64o and the heat exchange fin 61 group disposed at the rear of the heat exchange fin 61 group and welded to the outer peripheral surface of the water pipe 62, Between the isolation plates 66f and 66r and the left and right sides of the heat exchange fins 61 group (the front side and the back side in FIG. 6B). 7 (b)). The front and rear edges of the side plates 67L and 67R are welded to the isolation plates 66f and 66r, and the inner surfaces of the side plates 67L and 67R are welded to the side edges of the heat exchange fins 61. Further, the front support plate 63f and the front member 65f are welded and integrated, and the rear support plate 63r and the rear member 65r are also welded and integrated.
The cooling water inflow pipe 65i is connected to the cooling water intake port of the jet pump 30 via a cooling water hose 91 (see FIG. 5), and the discharge pipe 65o is connected to the turbocharger 70 via the cooling water hose 92 (see FIG. 5). The water muffler 77 is connected to a drain (not shown) through a water jacket (not shown).
Therefore, the cooling water W from the jet pump 30 flows from the inflow pipe 65i through the introduction chamber 64i through the plurality of water pipes 62, in the process, cools the water pipe 62 and the heat exchange fins 61 group, and discharge chamber 64o. Then, the water is discharged to the water muffler 77 through the discharge pipe 65o, the cooling water hose 92, the water jacket of the turbocharger 70, and the like.
[0016]
The case 51 is a two-piece case composed of a front case 51f and a rear case 51r. The cooling unit 60 is sandwiched between the front and rear cases 51f and 51r, and the front and rear cases 51f and 51r are coupled by a bolt 52. As a result, the cooling unit 60 is accommodated in the case 51. In a state where the cooling unit 60 is accommodated in the case 51, the outer peripheral edges of the isolation plates 66 f and 66 r are in close contact with the inner surface of the case 51.
6B, 53f and 53r are cushion materials interposed between the inner surface of the case 51 and the cooling unit 60, and in FIG. 7B, 54 is a gasket interposed between the split surfaces of the front and rear cases 51f and 51r. It is.
The front case 51f is formed with a cylindrical portion 51a into which the inflow pipe 65i of the cooling unit 60 is inserted. A tube 55 is provided so as to straddle the cylindrical portion 51a and the inflow pipe 65i. By fastening the tube 55 to the cylindrical portion 51a and the inflow pipe 65i with clamps 56 and 57, foreign matter does not enter the case 51. It is like that. The connection structure between the rear case 51r and the discharge pipe 65o of the cooling unit 60 is also the same.
[0017]
An intake inlet 51i is formed on the upper surface of the rear case 51r. The intake inlet 51 i is covered with an intake introduction member 58. The intake air introduction member 58 has an intake air introduction chamber 58a connected to the intake air inlet 51i above the intake air inlet 51i, and a pipe portion 58b extending to the rear side of the intake air introduction chamber 58a. The compressor part 71 of the supercharger (turbocharger) 70 is connected to the part 58b via the pipe 72 (see FIG. 5) described above. The intake air introduction member 58 is fixed to the upper surface of the rear case 51r via a gasket (not shown) with four bolts 58c.
A pipe portion 51b that forms an air outlet 51o is formed on the upper surface of the front case 51f, and this pipe portion 51b is connected to the intake inlet pipe portion of the surge tank 23 via a tube 51c (see FIGS. 4 and 6). 23a (see FIG. 4).
A communication path 51d is formed below the rear case 51r and the front case 51f so as to communicate with each other in a state where both are coupled (the state shown in FIG. 6).
Therefore, according to the heat exchanger 50 as described above, basically, air from the compressor portion 71 of the turbocharger 70 enters the rear case 51r downward from the intake inlet 51i and flows downward in the process. The heat exchange fins 61 in the front case 51f are cooled in contact with the heat exchange fins 61 in the case 51r, enter the front case 51f through the communication path 51d, and flow upward from below. Then, after further cooling, the water is supplied from the outlet 51o to the surge tank 23.
[0018]
By the way, in the heat exchanger having the basic configuration as described above, when no measures are taken, the original air flow path, that is, as described above, enters from the intake inlet 51i, and the heat exchange fin 61 and In addition to the flow path that exits from the outlet 51o after contact, there is also a flow path (C) that passes through the space C between the outer peripheral edge 61a of the heat exchange fin 61 (see FIG. 6B) and the inner wall surface 51e of the case 51. A part of the air that is formed and entered from the intake inlet 51i comes out of the outlet 51o through the space C with almost no contact with the heat exchange fins 61, resulting in a problem that the heat exchange rate is not sufficient. .
[0019]
Therefore, in the heat exchanger 50 of this embodiment, the space between the outer peripheral edge 61a of the heat exchange fin 61 and the case inner wall surface 51e is partially closed (in this embodiment, at least the space C), A plate 80 separate from the case 51 is provided to form an air flow path at a portion other than the blocking portion (that is, the original air flow path).
[0020]
8A and 8B are views showing the plate 80. FIG. 8A is a plan view, FIG. 8B is a front view, and FIG. 8C is a left side view.
The plate 80 is made of aluminum, and is basically a plate having a substantially T-shape in front view in which the first plate 81 and the second plate 82 are welded.
[0021]
The first plate 81 is a substantially inverted U-shaped plate when viewed from the side as shown in FIG. 1C, and has a head portion 81a extending to the left and right and a pair of leg portions 81b that are suspended from both ends. . A part of the leg 81b is bent backward to form a welding piece 81c with the second plate 82.
The first plate 81 can be configured by punching one plate and bending the welding piece 81c.
[0022]
As shown in FIG. 2B, the second plate 82 is a plate having a substantially mouth shape in plan view, and the mouth portion 82a and a pair formed so as to hang inside the left and right sides (up and down in FIG. 1A) of the mouth portion 82a. The hanging portions 82b and 82b are provided. The lower edge 82c of the drooping portion 82b is bent slightly outward.
Engagement pieces 82f and 82r with the isolation plate 66 (see FIG. 6B) of the cooling unit 60 described above are formed on the front and rear of the mouth portion 82a (left and right in the drawings (a) and (b)).
The second plate 82 is formed by punching one plate and bending the hanging portion 82b, its lower edge 82c, engaging pieces 82f and 82r, and engaging pieces 82d and 82d described later. Can do.
[0023]
As shown in FIGS. 1A and 1B, the first plate 81 and the second plate 82 include an upper inner surface of the welding piece 81c of the first plate 81 and an outer surface of the hanging portion 82b of the second plate 82. Are integrated by welding (welding) 84.
[0024]
Although the basic structure of the plate 80 is as described above, in this embodiment, the net member 85 disposed at the outlet 51o and preventing passage of foreign matter is integrally provided on the plate.
The net member 85 is made of metal (for example, aluminum). As shown in FIG. 5A, the frame portion 85a having a substantially mouth shape in plan view, and a net portion integrally formed with the frame portion 85a inside the frame portion 85a. 85b. The frame portion 85a is provided with two engagement holes 85d and 85d on the front side and one engagement hole 85e on the rear side. On the other hand, two engagement pieces 82d and 82d are integrally formed on the inside of the front portion of the mouth portion 82a of the second plate 82. Further, in the vicinity of the front side of the first plate 81 in the second plate 82, a support plate 83 on which an engagement piece 83b for fixing the net member 85 is formed is constructed. The support plate 83 is welded 86 to the inner side surface of the bulging portion 82e obtained by partially bulging the hanging portion 82b of the second plate 82 at the two hanging portions 83a and 83a. Are integrally provided.
The net member 85 is integrated with the plate 80 by engaging the engagement holes 85d, 85d, and 85e with the engagement pieces 82d, 82d of the second plate 82 and the engagement piece 83b of the support plate 83. Attached.
[0025]
The plate 80 as described above is attached to the cooling unit 60 in advance before the cooling unit 60 is assembled into the case 51 as described above. The cooling unit 60 is attached by fitting the upper part of the cooling unit 60 between the hanging parts 82b and 82b of the second plate 82 (see FIGS. 6B and 7B). The joining pieces 82f and 82r are engaged by engaging holes 66f1 and 66r1 (see FIG. 7B) formed in the isolation plates 66f and 66r (see FIG. 6B) of the cooling unit 60.
[0026]
In the state in which the cooling unit 60 to which the plate 80 is attached in this manner is incorporated in the case 51 as described above (the state shown in FIGS. 6 and 7), the first plate 81 of the plate 80 is connected to the cooling unit 60. In cooperation, the inside of the case 51 is separated from the intake inlet 51i side and the outlet 51o except for the communication passage 51d portion.
More specifically, the head portion 81a of the first plate 81 is located in the space C described above to block (close) an undesired air passage through the space C, and the leg portions 81b and 81b of the first plate 81 serve as a cooling unit. Positioned on both the left and right sides of 60, the spaces C1 and C1 formed between the side plates 67 (L, R) of the cooling unit 60 and the inner wall surface 51g of the case 51 (see FIG. 7B) are shielded (blocked). ).
[0027]
Further, as shown in FIG. 7B, the second plate 82 is positioned so as to be in contact with the upper edge of the side plate 67 (L, R) at the upper part of the cooling unit 60, and the left and right sides of the cooling unit 60 in plan view. In this case, the space C2 formed between the case 51 and the inner wall surface 51g is closed.
[0028]
According to the heat exchanger 50 as described above, the following operational effects can be obtained.
(A) An intake inlet 51i that is interposed between the supercharger 70 of the internal combustion engine 20 and the intake port 21 of the internal combustion engine 20 and communicates with the supercharger 70, and an outlet that communicates with the intake port 21 of the internal combustion engine. 51o and a heat exchange fin 61 accommodated in the case 51, and the space between the outer peripheral edge of the heat exchange fin 61 and the case inner wall surfaces 51e and 51g is partially (in this case) Since the space C, C1, C2) is closed, and a plate 80 separate from the case 51 is provided to form an air flow path at a portion other than the closed portion (in this case, the original air passage described above). All the air that has entered through the intake inlet 51 i comes out from the outlet 51 o after contacting the heat exchange fins 61.
Therefore, according to this heat exchanger 50, the heat exchange rate is improved, and the effect that the cooling efficiency of the intake air is improved can be obtained.
Also, when intake air blowback from the combustion chamber of the internal combustion engine 20 (so-called backfire) occurs, in the conventional heat exchanger, a part of the backfire entering from the outlet hardly comes into contact with the heat exchange fins. However, a special spark arrester or the like is required because the air may enter the supercharger 70 side through the space C and the like. However, according to this heat exchanger 50, the backfire is a heat exchanger. Therefore, there is no need to go directly from the outlet 51o to the intake inlet 51i via the space C, and the heat exchange fin 61 is contacted and cooled to extinguish the flame, so that it is not necessary to provide a dedicated spark arrester or the like.
Furthermore, since the plate 80 is separate from the case, the space between the outer peripheral edge of the heat exchange fin 61 and the inner wall surface of the case can be closed with a simple structure.
This point will be described in detail as follows.
The case 51 is divided into two to accommodate the cooling unit 60 (in this case, the front case 51f and the rear case 51r). These cases 51f and 51r are tapered at least on the inner wall surfaces (51e and 51g) in order to make it easier to accommodate the cooling unit 60 and to improve the mold release properties when molding the case. .
On the other hand, the basic structure (main part) of the cooling unit 60 is a structure in which a large number of heat exchange fins 61 are laminated and a water pipe 62 is passed through the stacked structure. Since it is desirable that the shapes of 61 are the same, it is very difficult to taper the entire outer shape along the inner surface of the case 51. As a result, the outer shape becomes a rectangular parallelepiped.
For this reason, a space is formed around the cooling unit 60 between the inner wall surface of the case 51, and conventionally, air from the intake inlet 51i leaks to the outlet 51o through this undesirable space. There was a problem (to be in a shortcut state).
Then, it is difficult to solve such a problem by changing the shape of the cooling unit 60 or changing the inner shape of the case 51 for the reasons described above. As a result, the heat exchange rate by the heat exchanger 50 is reduced. There was a problem of decline.
On the other hand, in this embodiment, as described above, the case 51 and the separate plate 80 are incorporated into the case 51, whereby the space can be closed with a simple structure and the above problem can be solved. .
[0029]
(B) Since the plate 80 is made of aluminum, the intake air and backfire that are in contact with the plate 80 are efficiently heat-sucked.
(C) The intake inlet 51i and the outlet 51o are formed on the same side of the case 51 (upper side in this embodiment), and the plate 80 is disposed between the intake inlet 51i and the outlet 51o. Since the space between the inner wall surface (51e, 51g) on the side where the inlet 51i and the outlet 51o are formed (the upper side in this embodiment) and the outer peripheral edge of the heat exchange fin 61 is closed, the plate 80 The heat exchanger 50 itself can be reduced in size.
(D) A plurality of heat exchange fins 61 are laminated at a predetermined pitch, and the plate 80 partially closes the space between the outer peripheral edge 61a of at least one of the heat exchange fins and the inner wall surface of the case. Therefore, it is possible to freely select the pitch (stacking interval) of the heat exchange fins 61 and the mounting position of the plate 80 (particularly, the first plate 81) effective for cooling efficiency and backfire extinguishing.
(E) Since the net member 85 for preventing the passage of foreign matter is provided at the outlet 51o, even if the supercharger 70 or the heat exchange fin 61 is deteriorated and part thereof is peeled off (or dropped off). These foreign matters (peeled matter or fallen matter) are not stopped by the net member 85 and reach the intake port 21 of the internal combustion engine 20.
In particular, when the heat exchanger 50 is used in the small vessel 10 as in this embodiment, the supercharger 70 and the heat exchange fins 61 are liable to deteriorate due to moisture and salt contained in the intake air. Such a configuration is particularly effective when the heat exchanger 50 is used in a small vessel.
(F) Since the net member 85 is integrally provided on the plate 80, the attachment of the net member 85 is performed at the same time as the assembly of the plate 80, thereby eliminating the trouble of attaching the net member 85 separately.
[0030]
Furthermore, according to the small planing boat 10 as described above, the following operational effects can be obtained.
(G) The internal combustion engine 20 with the supercharger 70 is mounted inside the hull 11 composed of the hull 14 and the deck 15, and the intake port 21 of the internal combustion engine 20 is provided between the supercharger 70 and the internal combustion engine 20. Since the communicating surge tank 23 and the intercooler 50 are provided, and the intercooler 50 is disposed immediately below the surge tank 23, the space S1 (see FIGS. 4 and 5) below the surge tank 23 should be used effectively. As a result, the narrow and valuable space in the hull 11 can be used effectively.
At the same time, since the intercooler 50 is arranged directly under the surge tank 23, the pipe 51c from the intercooler 50 to the surge tank 23 can be shortened as much as possible, and in the process of passing through the pipe 51c. As a result, the intake air cooling effect (intake air density) can be improved and the output of the internal combustion engine 20 can be improved.
(H) The intercooler 50 has an intake inlet 51i from the supercharger 70 and an outlet 51o to the surge tank 23 at the top thereof, and is one side of the internal combustion engine 20 (the rear side in this embodiment). Since the intake inlet 51i is provided near the supercharger 70 and the outlet 51o is provided near the other side, the supercharger 70, the intercooler 50, and the surge tank 23 are connected to the short pipelines (pipes 72 and 51c). ) Can be connected.
Moreover, a connection space between the outlet 51o of the intercooler 50 and the surge tank 23 directly above the intercooler 50 (a space formed between the intercooler 50 below the surge tank 23) S2 (see FIGS. 4 and 5) ) Can be used to connect the intake inlet 51i of the intercooler 50 and the supercharger 70, and the narrow and valuable space in the hull 11 can be used more effectively.
(I) A water-cooled intercooler 50 is a small planing boat disposed in the intake system of the internal combustion engine 20, and includes a cooling water passage 91 that supplies cooling water W supplied to the intercooler 50 from outside the planing boat 10. Therefore, according to the small planing boat 10 on which the internal combustion engine 20 with the supercharger 70 is mounted, the intercooler 50 is cooled by low-temperature water (seawater or the like) taken from the outside of the planing boat. Become.
Therefore, the other heat exchanger for cooling the intercooler 50 becomes unnecessary.
(J) Since the cooling water passage 91 communicates the jet pump 30 that propels the personal watercraft and the intercooler 50, the cooling water supply from the jet pump 30 through the cooling water passage 91 is performed to the intercooler 50. It will be done after that.
Therefore, another pump for supplying the cooling water to the intercooler 50 becomes unnecessary.
(K) Since the cooling water passage 91 directly communicates with the jet pump 30 that propels the small planing boat and the intercooler 50, the intercooler 50 is directly connected to the cooling water from the jet pump 30 (other cooling targets). The body (for example, without going through the internal combustion engine 20 or the turbocharger 70) is cooled.
Therefore, the intake air density is further improved, and the output of the internal combustion engine 20 is further improved.
(L) The cooling water hoses 91 and 92 can be changed so that the cooling water is supplied into the intercooler 50 from the intake inlet 51i side. Thus, the intake inlet 51i side is efficiently cooled.
Therefore, the cooling effect of the intake air as a whole of the intercooler 50 is further improved, and the output of the internal combustion engine 20 is further improved.
[0031]
Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified within the scope of the gist of the present invention.
For example, the shapes of the plate 80 and the net member 85 can be appropriately changed according to the inner shape of the heat exchanger 50, the shape of the heat exchange fins 61, and the like.
[0032]
[Brief description of the drawings]
FIG. 1 is a schematic side view showing an example of a small vessel using an embodiment of a heat exchanger according to the present invention.
FIG. 2 is also a plan view.
3 is a partial enlarged sectional view taken along line III-III in FIG. 1 (partially omitted sectional view).
4 is a diagram mainly showing the engine 20, and is a partially enlarged sectional view taken along the line IV-IV in FIG. 1 (a partially omitted sectional view).
FIG. 5 is a schematic perspective view of the engine 20 as viewed obliquely from the rear.
6A and 6B are views showing the heat exchanger 50, wherein FIG. 6A is a plan view, and FIG. 6B is a partially cutaway front view.
7A and 7B are views showing the heat exchanger 50, where FIG. 7A is a right side view, and FIG. 7B is a cross-sectional view taken along line BB in FIG. 6B.
8A and 8B are diagrams showing a plate 80, where FIG. 8A is a plan view, FIG. 8B is a front view, and FIG.
[Explanation of symbols]
10 Small ship
20 engine (internal combustion engine)
21 Inlet
50 heat exchanger
51 cases
51i Inlet entrance
51o Exit
51e, 51g Case inner wall
C, C1, C2 space
61 Heat exchange fin
61a outer periphery
70 Turbocharger (supercharger)
80 plates
85 Net members

Claims (4)

A case that is interposed between a supercharger of an internal combustion engine and an intake port of the internal combustion engine, and has an intake inlet that communicates with the supercharger and an outlet that communicates with the intake port of the internal combustion engine formed on the same side And heat exchange fins laminated in a direction perpendicular to the flow direction of the cooling water at a predetermined pitch and covered on both side surfaces with side plates, and the intake inlets and outlets are provided on the open surfaces of the heat exchange fins. A heat exchanger housed in the case toward the other side ,
Provided with a plate that is attached to the surface of the heat exchange fin facing the intake inlet and outlet and is accommodated in the case together with the heat exchange fin;
The plate closes a space between an inner wall surface of the case where the intake inlet and the outlet are formed and an outer peripheral edge of the heat exchange fin between the intake inlet and the outlet. A first plate for closing a space formed between the side plate and the inner wall surface of the case;
A second plate integral with the first plate, having an opening facing the intake inlet and outlet of the case, and positioned so as to contact the upper edge of the side plate; And a second plate for closing a space formed between the inner wall surface of the heat exchanger. To the outlet, the heat exchanger according to claim 1, wherein the net member for free passage prevention is provided. The heat exchanger according to claim 2 , wherein the net member is provided integrally with the plate. The heat exchanger according to claim 2 or 3 , wherein the heat exchanger is used for a small ship.

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